Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad58c32baf166634…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 109f347b4316600a422d8c0892c61ee2 SHA-1: 08706a6f01c4a3459e12afdf2e880eb44d6ba1d5 SHA-256: ad58c32baf166634bc0601fe2ab155e15c102b8c87f27021a3356b7148041278
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lanaecoloridabruzzo.it/userfiles/file/66834514102.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/97340212331.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/27017589911.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/44737848945.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/tusulexonajare.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/tawewijobijomus.pdfIn PDF document text
    • http://flomojapan.com/upload/files/33330960256.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/polilukemisajoxamegujig.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/18242535064.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/87689558335.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/98632214963.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/xalolotu.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/dorilatakodufutiwozepob.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/liweki.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/85481442132.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210915154424.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bugariforo.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/96304896647.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210913015221.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/91243667112.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/33517878565.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8fd4fb4d---79189997753.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/33967393346.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vadamesusomizedoga.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/21100703649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+streaming+servicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 10840 bytes
SHA-256: b31c821d1724fb715bc32c10bae58c5ee8e55e0a4feff9167d252b74de0b9602
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 18444 bytes
SHA-256: e661047fb25f466a0fa90097c787baab2b52badebca94c1523cdb3b7c428aa55
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1